Implantable surgical membrane



FIG. 1 is a top perspective view of an implantable surgical membrane in accordance with the design.

FIG. 2 is a top view of an implantable surgical membrane; and,

FIG. 3 is a bottom view of an implantable surgical membrane.

The structures drawn in broken lines are included for environmental purposes only, and do not form part of the claimed design. 

CLAIM The ornamental design for an implantable surgical membrane, as shown and described. 